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For most of my life I've been told that 13 degree launch and 2500 spin is optimal. Yet, I've seen it discused that the optimal numbers can change based on swing speed. Does anyone have a chart with these parameters. I'm specifically looking at the optimal launch conditions for a swingspeed of 120 to 125 mph.

I don't think you could apply that graph to your swing because it is for a ball speed of 155 mph. You ball speed would be something like 187 mph (at a perfect 1.5 smash factor) which is close to Bubba Watson and a good bit slower that most WRXers. I think short hitting Bubba launches at 17 degrees or higher with a spin around 2,000-ish.

I don't think you could apply that graph to your swing because it is for a ball speed of 155 mph. You ball speed would be something like 187 mph (at a perfect 1.5 smash factor) which is close to Bubba Watson and a good bit slower that most WRXers. I think short hitting Bubba launches at 17 degrees or higher with a spin around 2,000-ish.

Regardless of the OP's actual ballspeed, the chart still applies. High launch combined with low spin, will produce the most distance.

Of course, with his swingspeed, you would have to add 50+ yds to the charted distances.

Speaking of Bubba, attached are his numbers from a recent fitting (posted by Ping Golf via FaceBook).

To be honest I'm not sure of my ball speed. I've only used vector machines and can get ball speeds of high 180s and swing speeds in 130s on that, but I don't consider this to be an accurate machine whatssoever. I feel like I might be launching a little low right now and I'm just trying to figure out what would be optimal so when I do go to a track man I know what to look for.

I have to play science teacher here. The graph shown is what we call a nomograph or nomogram. It is a graphical calculator, kind of like a slide rule (for those that remember those) solved for a specific function.

This one solves an function for 4 parameters: Launch Angle, Ball Spin, Drive Distance, and Ball Speed. The Ball Speed parameter is fixed at 155 mph (the nomograph is "solved" for 155 mph).

For any Ball Speed other than 155 mph you would have to prepare a new nomograph for that new Ball Speed (solve the nomograph for the new Ball Speed). So no, you can't use the graph for a Ball Speed of 187 mph.

What some of you are saying is that you can guess what the nomograph would look like solved for a Ball Speed of 187 mph and that you think it may indicate that a Launch Angle over 12 degrees and Ball Spin under 2,500 rpms would be ideal. And you are probably correct (and I agree)...although it is just a guess. End of lesson.

Thanks for the lesson. I've seen all the charts for the different ball speeds during my Titleist fitting & yes the chart applies. I don't recall the specific distances for 185 mph ball speed, but the chart was exactly the same. Same max distance achieved with high launch low spin. No arguing that.